Mopar 5179919AA Booster-Power Brake

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The power brake booster unit requires no special maintenance apart from periodic inspection of the vacuum hose and the case. The power unit is not repairable. If a problem develops, it must be replaced. To perform an operating check, depress the brake pedal several times with the engine off and make sure that there is no change in the pedal reserve distance. Then, depress the pedal and start the engine. If the pedal goes down slightly, operation is normal. For an airtightness check, start the engine and turn it off after one or two minutes. Depress the brake pedal several times slowly. If the pedal goes down farther the first time but gradually rises after the second or third depression, the booster is airtight. Another airtightness check involves depressing the brake pedal while the engine is running, then stopping the engine with the pedal depressed. If there is no change in the pedal reserve travel after holding the pedal for 30 seconds, the booster is airtight. To remove the power brake booster, first remove the master cylinder. On Durango models, also remove the cowl cover, cowl support brace, and windshield wiper arm bracket assembly. Disconnect the vacuum hose from the power brake booster, but do not remove the check valve. Working under the dash, disconnect the power brake push rod from the top of the brake pedal by prying off the clip. Remove the nuts attaching the booster to the firewall. Carefully lift the booster unit away from the firewall and out of the engine compartment, noting the placement of gaskets and spacer blocks. To install the booster, place it into position and tighten the retaining nuts. Connect the booster push rod to the brake pedal. Install the master cylinder. Connect the vacuum hose to the brake booster assembly. Bleed the brake system. Finally, carefully test the operation of the brakes before placing the vehicle in normal operation.